Mine stemple comprising two telescoping sections



MINE STEMPEL COMPRISING TWO TELESCOPING SECTIONS K. GERLACH June 2, 19533 Sheets-Sheet 1 Filed Dec.

' Inventor:

H r C W .6 Mk 6 Y 8 K. GERLACH June 2, 1953 MINE STEMPEL COMPRISING TWOTELESCOPING SECTIONS 3 Sheets-Sheet 2 Filed Dec. 13 1950 my. a

June 2, 1953 I K. GERLACH MINE STEMPEL COMPRISING TWO TELESCOPINGSECTIONS 3 Sheets-Sheet 3 Filed Dec. 13 1950 Inventor:

KA 24 c; 5/?4 A 01 WW ,4 4 67V r Patented June 2, 1953 UNITED s'TA'rssPATENT OFFICE MINE ."S'I-IEMPLE COMPRISING TWO- TELE'SCO PING SECTIONSKarl "Gerlac'h, Moe'r's, Germany application December 13, 19-50, s nman-s09 fIn Gerni'any'Decembex- 14, 1949 "6 Claims.

"The invention relates 170 2a 'min'e prop or stemple in two parts "in."which the inner s'temple is under the control of a'lcey orwedgewhichmay. for example, be slidable in the rigid pocket or "a lock and whichcarries the key along over'aportion'of its path or" travel as itsinksin't'othe lower stemple. 'By carrying along this sliding wedge theresistance of the steinpleagainst yielding is to be rapidly increased ifthe inner stemple "sinks into the lower stemple under the effectsofmuuntain'pressure. "However, as soon as the 'stem'pl'e has attainedits maximum engagement pressure, the further sliding of the wedge mustcease and "the inner stemple should sink intotne lower stempleindependently.

For "the course of the stemple resistance it is of decisive significancein such mine stem'ples'to attain the same initial position of thesliding wedge each time the stemple is set. For'thispurpose the slidingwedge was "provided with abutments which limited the possibility ofits-movement upwardly and which, during placing was brought into "thestarting position either auto- "matically, by means of a spring, ormanually.

The manual "operation had the disadvantaged? being dependent on thecarefulness of the operator. Also, bymeans of the spring it was not"possible to reliably attain an initial position which was the same inall cases, because the sprin wasfi'rst of all subject to phenomena ofweakening and was frequently hampered in its efiectiveness byunexpecte'dresistances. Besides,

alsothe sensitivity of the spring to interference caused by the ruggedconditions of the mining operations was a disadvantage.

mining the initial position of the sliding wedge with a setting device,for example, in the form of a cross-key. In this respect theinventioncan preferably be realized ior stemples in which the slidingwedge is connected with the inner stemple by an automatically releasablecoupling. -In

that case the setting device "which is combined with the "intermediatemember may, "for the purpose of setting, engage the coupling member andset the stemple simultaneously as the intermediate member is introduced.The coupling mem- :ber may, for this purpose, be in the form of a loadclamp "which wedges itself on the inner stemple and rests at one endupon the sliding wedge.

In accordance with a particularly preferred embodiment of the inventionthe sliding wedge and the intermediate member may be coupled bycompulsory guide means in such a manner, that ior each position of theintermediate member there is a predetermined corresponding position oithe sliding wedge. For example, the sliding wedge and theintermediatemember may, for thi purpose 'interengage by means ofrecesses in theiorm of grooves.

by means of such a grooved engagement the position of the sliding wedgeis absolutely fixed upwardly and downwardly in any desired initialposition, so that it is assured that the slidin wedge always assumes its"desired predetermined initial position as 'the intermediate member isoperated.

More in particular, the invention may be realized, for example, in thatthe sliding wedge is provide-a with a"'shduiiier or abutment whichenages 'ag'roove or recess in the intermediate member. On 'theotherhand, "embodiments "of the invention are possible where the intermediatemember engages a groove in the sliding wedge by means for a ledge orprojection.

i 'or 'thecas'e where-the intermediate member is used simultaneously asa setting device for a wedge clamp which engages the inner stemple,there exists a further essential advantage of the :present invention inthe possibility of bringin the intermediate member to rest upon aninsert in the steeple lo'ck which is not automatically 1ockingfinsroad"oi the steznple lock proper.

in iron mine stamp-leg where the inner stem plc is wedge shaped, it ispossible to realize the invention in a manner that "the wedge 'cl'ampwhich clamps itself "to the inner stempl'e by means of its edges andrests at one end upon the sliding wedge, forms "a temporary cou ling"between "the inner stemple "and "the sliding wedge and "is made toengage the parallel wall planes 'dr'the profile 6f the inner 'stem'ple.

The parallel wall planes'may, for example, be provided upon ribs for"other projections of the cross=section "of the inner 's't'emple whichare 'in "dependent 'o'r' tne wedge ortaper'e'd Iform of the inner'ste'm'ple. In this manner the advantage "is obtained that independentlyof the wedge shape "of the inner stem'ple' reliable wedging of the loada clamp is assured. This is not always the case, when the load clampengages the wedge shaped planes of the inner stemple, because thetolerance between the clamp and the downwardly tapering inner stemplebecomes too great if the inner stemple is pulled out of the outerstemple during setting.

Further advantageous details of the invention are shown in the drawingin which the invention is illustrated by way of examples and in. which:

Fig. 1 is a side elevation of a mine stemplein accordance with theinvention in robbed con-- dition;

Fig. 2 is a plan view in accordance with Fig. 1;

Figs. 3 and 4 show the same stemple in side: elevation in two differentsetting positions;

Fig. 5 is a view from the right hand side of .of the invention.

In the drawings like reference numerals refer to corresponding parts. Iis the inner stemple which is preferably tapered or wedge shaped, 2 isthe outer stemple and ,3 the sliding wedge which is supported by ahorizontal key 5 in the stemple look 6 by way of an insert 4 which isnot self locking. The insert 4 here rests in the stemple lock 6 againsta movable insert member I by means of the key plane 8 which is not selflooking. 9 is the wedge clamp which can be made to engage the parallelwall planes It of the inner stemple which are provided upon parallelwalled ribs II on the inner stemple section.

In Fig. 1 a two section mine stemple is shown in robbed, i. e. infullyinserted condition. The loading or wedge clamp 9 in this case restsupon the sliding wedge 3 as well as upon outer stemple 2 so that thecoupling with the inner stemple I is released. The sliding key 3 restsupon the lock 6 with its plane I2.

In Fig. 3 an intermediate member I3 has been placed between slidingwedge 3 and lock 6 in such a manner, that the sliding wedge is pulledout of the stemple lock B by a predetermined amount and a space a isformed between the upper edge of the lock 6 and the plane I2, over whichdistance the sliding wedge 3 is carried along by the wedge clamp 9 whenthe inner stemple sinks so that the sliding wedge 3 is assigned apredetermined path in order to thus obtain a definite resistance curveof the stemple- The initial position of the sliding wedge 3 is thereforedetermined by the intermediate member I3. It is seen from Fig. 5 thatthe intermediate member I3 is provided with a slope I4 by means of whichthe intermediate member may readily be moved between the sliding wedge 3and lock 6.

A key I5 is rigidly connected with the intermediate member I3 which keyrests at its lower end upon the lock 6 and whose upper oblique edgerests under the load clamp 9.

The operation takes place in the following manner: The key I5 with theintermediate member I9 is pushed between sliding wedge 3 and lock 6 ofthe inserted stemple in accordance with Fig. 1 until the sliding wedge 3has reached its full height a. Since the load clamp 9 now rests nolonger upon the lower stemple 2 it is possible to pull the inner stemplemanually to the,

overhanging slope and the load clamp 9 holds it in this position becauseas the inner stemple I is released it immediately and automaticallyassumes a wedged position.

If the key I5 is now driven in as shown in Figs.

4 and 5 it presses the inner stemple upwardly against the overhang bymeans of load clamp 9 which as a result of this movement is wedged uponthe inner stemple I. Since the intermediate member I3 extends with eventhickness alon the setting key It no movement of the sliding key 3 takesplace during setting operation. It must be mentioned here that thesliding wedge is provided with abutments or shoulders IE to limit themovement in an upward direction.

N ow the horizontal key 5 is fastened as the intermediate member I3 isremoved with the setting key l5. The wedge clamp 9 then drops upon thewedge key 3 and wedges with the ribs II of the inner stemple I when theinner stemple I begins to sink into outer stemple 2 under the influenceof the mountain pressure. As a consequence of this wedging the innerstemple I carries along the slidin wedge 3 downwardly over apredetermined distance, i. e. the distance a, whereupon the wedgingclamp 9 comes to rest upon the abutment 23 of the stemple lock 6 or ofthe outer stemple 2 and its wedging efiect is eliminated.

In the example illustrated intermediate mem ber l3 and the wedge key I5are combined into a unitary member. Naturally their separate embodimentsare possible. Besides it is possible to form the intermediate member I3in a manner that its thickness can be varied by adjustable means and tothus change the distance a for the sinking path of the sliding wedgewithin certain limits.

The arrangement of the upper edge of the intermediate member I3 whichengages the sliding wedge 3 determines the height of withdrawal of thesliding wedge so that it is possible for example, to raise the slidingwedge during setting by distances of approximately 4', or 1". Since thesinking path of the sliding key 3 determines the pressure absorption thepressure curve of the stemple is thus changed. In robbing the stemplethe loading clamp 9 can be disconnected. This disconnecting can be aidedby additional means as, for example, springs or the like.

It is also possible to provide the arrangement in such a manner as todivide the key I 5 so that the raising of the slidin key by theintermediate member I3 is effected from the lock side while the raisingof the inner stemple I is effected at the back side by means of aspecial wedge clamp which serves only for setting. In this connectionthe key and the intermediate member have as a whole a bifurcated form.

In the embodiment in accordance with Fig. 6 the intermediate member I3is provided with two ledges I1 and I8 which engage a shoulder I9 of thesliding wedge 3 in the manner of a groove. By means of such a groovelikeengagement between sliding wedge 3 and intermediate member I3 theposition of the sliding wedge 3 is determined with absolute certainty bydriving in the intermediate member I3 which is in the form of a key moreor less deeply, so that the adherence to a definite path of the slidingwedge is insured. The intermediate member I3 may here as in thepreviously described illustrations be formed as a setting key and forthis purpose it may engage the wedge clamp 9. Suitably it does not restupon the stemple lock 6 here but upon the insert 4. When the stemple isset the insert 4 is here pressed downwardly as the intermediate memberI3 is driven in and in view of its key plane 8 which is not self lockingand the insert piece 1 all tolerance in the stemple lock can beeliminated and particularly the inner stemple i can be securely pressedbetween the back of the lock or the opposite side of the outer stemple2. In driving in the horizontal key 5 the insert t in lock 6 which isnot self locking is secured in its position and simultaneously the lockis placed under tension. Now if upon elimination of the setting deviceand thus also of the intermediate member l3 the inner stemple I sinksdownwardly under the mountain pressure and carries along the sliding keyI 3 by way of the wedge clamp 9 downwardly, a large amount of thestemple load becomes immediately effective in the lock 6 before theinner stemple can sink in without encountering noticeable resistance toeliminate unusual tolerances between the portions of the look.

In the embodiments in accordance with Fig. 7 v

the intermediate member I3 which is also constructed as a setting deviceis provided with a ledge 20 which engages one or two ledges 2| and 22 ofthe sliding wedge 3. The manner of operation is the same here asexplained in connection with the embodiment of Fig. 6.

Having thus fully described my invention and its method of operationwith reference to the embodiments shown in the drawings, I claim:

1. A mine stemple comprising two telescoping sections, a lock secured tothe outer of said sections, clamping means extending intermediate saidlock and the inner of said sections, a sliding wedge disposedintermediate said lock and said inner section and means adapted todetermine the initial position of said sliding wedge comprising anintermediate member defining a ledge movably disposed intermediate saidsliding wedge and said outer section adjacent said lock.

2. A mine stemple comprising two telescoping sections, a lock secured tothe outer of said sections, clamping means extending intermediate saidlock and the inner of said sections, a sliding wedge disposedintermediate said lock and said inner section and means adapted todetermine the initial position of said sliding wedge comprising anintermediate member defining a ledge movably disposed intermediate saidsliding wedge and said outer section adjacent said lock, saidintermediate member including a portion defining a transverse key havinga sloping surface in engagement with said clamp, whereby said innerstemple may be moved vertically in response to horizontal movement ofsaid intermediate member.

3. A mine stemple comprising two telescoping sections, a lock secured tothe outer of said sections, clamping means extending intermediate saidlock and the inner of said sections, a sliding wedge disposedintermediate said lock and said inner section and means adapted todetermine the initial position of said sliding wedge comprising anintermediate member defining a ledge movably disposed intermediate saidsliding wedge and said outer section adjacent said lock, saidintermediate member having a conformation defining a slope at the end ofsaid ledge which first engages said sliding wedge.

4. A mine stemple comprising two telescoping sections, a lock secured tothe outer of said sections, clamping means extending intermediate saidlock and the inner of said sections, a, sliding wedge disposedintermediate said lock and said inner section and means adapted todetermine the initial position of said sliding wedge comprising anintermediate member movable transversely of said sections and an insertmember disposed in said lock having surface engagement with said slidingwedge, with said intermediate member and with components of said lock.

5. A mine stemple comprising two telescoping sections, a lock secured tothe outer of said sections, clamping means extending intermediate saidlock and the inner of said sections, a sliding wedge disposedintermediate said lock and said inner section and means adapted todetermine the initial position of said sliding wedge comprising anintermediate member movable transversely of said sections and an insertmember disposed in said lock having surface engagement with said slidingwedge, with said intermediate member and with components of said lock,said intermediate member including a portion defining a transverse keyhaving a sloping surface in inner stemple and an intermediate membermovable transversely of said telescoping sections adjacent said lock,said intermediate member including a shoulder adapted to engage aconformation on said sliding wedge and a sloping portion adapted toengage said clamp.

KARL GERLACH.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 2,297,469 Groetschel Sept. 29, 1942 2,445,543 Thines July 20,1948 2,514,965 Pierre July 11, 1950

